Server-Sent Events Client

# SPDX-FileCopyrightText: 2023 Michał Pokusa # # SPDX-License-Identifier: Unlicense from time import monotonic import microcontroller import socketpool import wifi from adafruit_httpserver import GET, Request, Response, Server, SSEResponse pool = socketpool.SocketPool(wifi.radio) server = Server(pool, debug=True) sse_response: SSEResponse = None next_event_time = monotonic() HTML_TEMPLATE = """ Server-Sent Events Client

CPU temperature: -°C

""" @server.route("/client", GET) def client(request: Request): return Response(request, HTML_TEMPLATE, content_type="text/html") @server.route("/connect-client", GET) def connect_client(request: Request): global sse_response if sse_response is not None: sse_response.close() # Close any existing connection sse_response = SSEResponse(request) return sse_response server.start(str(wifi.radio.ipv4_address)) while True: server.poll() # Send an event every second if sse_response is not None and next_event_time < monotonic(): cpu_temp = round(microcontroller.cpu.temperature, 2) sse_response.send_event(str(cpu_temp)) next_event_time = monotonic() + 1